Hi Nicky, there are many things about your experience with your son which sound familiar. My son, PH, has just turned ten and was diagnosed three years ago with the break on the long arm at 34.3 to 35.2. He never crawled, didn't sit on his own until he was eighteen months, didn't stand until he was almost two and took his first steps shortly there after. He climbed nothing - not onto a chair... into his bed.. anything until the week before he turned five. Even today he won't go up more than two rungs on a ladder. You cannot pick him up. He hates his feet being off the ground. He also has global hyptonia, which causes us the most problem as it manifests itself most severely in his bowels - he has both mega colon and encopresis - so he is still diapered at ten. The hypotonia also impacts his hands (hard time writing) and his speech (lacks clarity). He has language processing issues, particularly related to reading and writing, but aside from that he is working at grade level or above in all other subjects, especially math and geography. PH began physical therapy at age two and continued it through age of eight. We lucked out two years ago when the local ski hill decided to run a pilot project with a couple of special needs children. PH fell in love with skiing. At first he could only manage a run or two on the bunny hill but by the end of the first season, the improvement to his muscle tone was significant. By the end of the last season he was able to ski the whole hill, except the double black diamonds. His stamina and muscle tone have grown by leaps and bounds. Anyways... am here if you'd like to chat more.